Ground surface draw-out type fire prevention and extinguishment structure of nonferrous metal spontaneous combustion mine

Abstract

The utility model discloses an earth surface draw-out type fire prevention and extinguishment structure of a nonferrous metal spontaneous combustion mine, which comprises a main body assembly and a fire extinguishing device, the fire prevention and extinguishing assembly comprises an air inlet shaft, an underground fire area and a fire area isolation belt crack area; the air inlet shaft is fixed to one side of an opening of the mine body, the underground fire area is arranged in the mine body, and the fire area isolation belt fissure area is arranged in the mine body and tightly attached to one side of the underground fire area. The problems that existing in-mine fires occur in laneways and goaf areas within a certain range, poisonous gas spreads everywhere along with air flow in the laneways, and CO and SO2 are not prone to diffusion and dilution; cracks appear in partial areas, ash reburning is caused, specific crack communication areas are not prone to being found, and blocking is not prone to occurring when the crack communication areas are found; the negative pressure of a main fan is too large, so that part of air in a fire area enters a workplace, CO and SO2 are sucked into an area where people walk, and potential safety hazards are generated. And air in a fire area causes air temperature rise in an operation area.

Description

Technical Field

[0001] The utility model relates to the technical field of mine ventilation system control, in particular to a surface extraction type fire prevention and extinguishing structure for non-ferrous metal spontaneous combustion mines. Background Technique

[0002] The three elements of spontaneous combustion in non-ferrous metal underground mines are as follows: First, the oxidation heat generation of ore, such as a large amount of strong reducing elemental sulfur, low-valent sulfur compounds, etc.; second, effective oxygen supply; third, reaching the ignition point. When the ore exceeds the ignition point, the oxidation exothermic reaction rate increases, and the heat release increases violently, resulting in the continuous progress of the reaction until the ore burns out.

[0003] However, it still has the following disadvantages in actual use:

[0004] Existing mine fires occur in a certain range of roadways and goafs. Toxic gases spread everywhere along with the air flow in the roadway, and CO and SO2 are not easily diffused and diluted; the closed underground fire area is affected by underground mining activities and ground pressure change activities, and cracks appear in some areas, resulting in the reignition of ashes. The specific crack connection areas are not easy to find, and it is not easy to seal even if found; if the main fan negative pressure is too large, some air in the fire area will enter the working area, and CO and SO2 will be pumped into the area where people walk, resulting in major safety hazards; the air in the fire area causes the air temperature in the working area to rise. Content of the Utility Model

[0005] The purpose of the utility model is to provide a surface extraction type fire prevention and extinguishing structure for non-ferrous metal spontaneous combustion mines, so as to solve the problems raised in the above background technique.

[0006] To solve the above technical problems, the utility model is realized through the following technical solutions:

[0007] The utility model is a surface extraction type fire prevention and extinguishing structure for non-ferrous metal spontaneous combustion mines, including:

[0008] A main body component, the main body component includes a mine body;

[0009] A fire prevention and extinguishing component, the fire prevention and extinguishing component includes an air inlet shaft, an underground fire area, and a crack area of the fire area isolation belt;

[0010] The air inlet shaft is fixed on one side of the opening of the mine body, the underground fire area is arranged inside the mine body, and the crack area of the fire area isolation belt is arranged inside the mine body and is closely attached to one side of the underground fire area.

[0011] Furthermore, a production well is arranged deep inside the mine body, and the production well is opposite to the crack area of the fire area isolation belt in position.

[0012] Further, SO2 online monitoring devices are fixed on the surface of the underground fire area and inside the middle production well, and a variable-frequency main fan is fixed on the other side of the opening of the mine body.

[0013] Further, forced draft fans are arranged inside the production wells on both sides of the middle part, and an airtight wall for air flow is arranged on one side of the surface wall of the production well.

[0014] Further, the underground fire area is in a sealed isolation area, the surface part is covered and filled with mud, and isolation walls are built in each underground section.

[0015] Further, the crack area of the fire area isolation belt is the covering layer of the fire isolation area, and isolation walls are built in each underground section.

[0016] Compared with the prior art, the advantages of the present utility model are as follows:

[0017] First, in the present utility model, through the cooperation of different operating conditions of the variable-frequency main fan, forced draft fan, and natural fire area air pressure, the production requirements under different conditions are realized. This structure is simple, the adjustment method is flexible, the impact on mine production is small, it has significant cost and efficiency advantages, has engineering practical value, and effectively solves the problem of restoring normal production ventilation after the fire area is blocked in non-ferrous metal spontaneous combustion mines.

[0018] Second, based on the first beneficial effect, at the same time, through the SO2 online monitoring device to detect the inside of the production well and the mine body, it is possible to timely discover the situation where the air in the fire area is drawn into the operation area, so as to take corresponding measures to adjust the operation of the variable-frequency main fan, reduce the harm of poisonous smoke, poisonous dust, and high temperature to underground workers, improve the operation safety of the mine, and promote intelligent development.

[0019] Of course, it is not necessary for any product implementing the present utility model to achieve all the above-mentioned advantages simultaneously. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0021] Figure 1 It is a schematic diagram of the surface extraction type fire prevention and extinguishing ventilation structure of the non-ferrous metal spontaneous combustion mine of the present utility model;

[0022] Figure 2 It is a schematic diagram of the air flow direction during normal production of the present utility model;

[0023] Figure 3This is a schematic diagram of the air flow direction during the reignition of the fire area of the utility model.

[0024] In the attached drawings, the list of components represented by each reference numeral is as follows:

[0025] 1. Mine body; 11. Intake shaft; 2. Underground fire area; 3. Fissure area of the fire area isolation belt; 4. Production well; 5. SO2 on-line monitoring equipment; 6. Variable-frequency main fan; 7. Pressurized fan; 8. Airtight wall of the air flow. Specific embodiments

[0026] To make the above objects, features, and advantages of the utility model more obvious and understandable, the following will describe the specific embodiments of the utility model in detail with reference to the attached drawings.

[0027] In the following description, many specific details are set forth in order to fully understand the utility model. However, the utility model can also be implemented in other ways different from those described herein. Those skilled in the art can make similar generalizations without departing from the connotation of the utility model. Therefore, the utility model is not limited by the specific embodiments disclosed below.

[0028] To make the purpose, technical solution, and advantages of the utility model clearer, the following will further describe the embodiments of the utility model in detail with reference to the attached drawings.

[0029] Please refer to Figures 1 - 3 As shown, this embodiment is a surface extraction type fire prevention and extinguishing structure for a non-ferrous metal spontaneous combustion mine, including:

[0030] The main body component, and the main body component includes the mine body 1;

[0031] The fire prevention and extinguishing component, and the fire prevention and extinguishing component includes the intake shaft 11, the underground fire area 2, and the fissure area 3 of the fire area isolation belt;

[0032] The intake shaft 11 is fixed on one side of the opening of the mine body 1. The underground fire area 2 is arranged inside the mine body 1. The fissure area 3 of the fire area isolation belt is arranged inside the mine body 1 and is close to one side of the underground fire area 2;

[0033] The intake shaft 11 is the intake air passage of the mining area, including vertical shafts, inclined shafts, ramps and other mine roadways. The underground fire area 2 is an airtight isolation area, and the fissure area 3 of the fire area isolation belt is the covering layer of the fire isolation area;

[0034] A production well 4 is arranged deep inside the mine body 1, and the production well 4 is opposite to the fissure area 3 of the fire area isolation belt;

[0035] The production well 4 is the return air shaft of the production area stope;

[0036] An SO2 on-line monitoring device 5 is fixed on the surface of the underground fire area 2 and inside the intermediate production well 4, and a variable-frequency main fan 6 is fixed on the other side of the opening of the mine body 1;

[0037] The SO2 on-line monitoring mainly monitors the SO2 content near the operation area inside the mine body 1. Once detected, it indicates that the fire area air has been drawn into the operation area. The negative pressure of the variable-frequency main fan 6 is high, and it is necessary to guide the adjustment operation or use of the variable-frequency main fan 6;

[0038] The variable-frequency main fan 6 can adjust the operation speed of the main fan, generate different operating points, form different air volume and air pressure operating states, and meet the production requirements under different production conditions;

[0039] Pressurized fans 7 are arranged inside the production wells 4 on both sides in the middle, and an airtight wall 8 for air flow is arranged on one side of the surface wall of the production well 4;

[0040] The pressurized fan 7 is the pressure equalizing fan for the production stope. The purpose is to balance the difference between the variable-frequency main fan 6 and the natural wind pressure of the fire area, and cut off and reduce the air supply to the fire area;

[0041] The airtight wall 8 for air flow is a ventilation isolation structure for the fire area. It realizes underground fire extinguishing by isolating the oxygen supply to the fire area. Two airtight walls 8 for air flow are also arranged on the wall between the underground fire area 2 and the fissure area 3 of the fire area isolation belt;

[0042] The underground fire area 2 is a closed isolation area, with the surface part covered and filled with mud, and isolation walls are built in each underground section;

[0043] A fire isolation section is left between the underground fire area 2 and the lower production area;

[0044] The fissure area 3 of the fire area isolation belt is the covering layer of the fire isolation area, and isolation walls are built in each underground section;

[0045] The fissure area 3 of the fire area isolation belt is the ventilation channels such as fissures, collapses, and cavities generated in the middle section under the influence of different factors;

[0046] Working principle:

[0047] After measures such as surface covering, isolation, and grouting are carried out on the fire area, the temperature of the fire area gradually decreases. Due to the wide range and frequent underground pressure activities, ventilation channels such as fissures, collapses, and cavities are likely to appear in the fire area isolation area, thus forming the fissure area 3 of the fire area isolation belt. Under the action of natural wind pressure, osmotic pressure, underground water, etc., oxygen can fully contact with the combustible ore and rock through the fissure area 3 of the fire area isolation belt. After a period of time, the ashes reignite, and new fire areas are formed in some areas of the ore and rock;

[0048] During normal production periods, the fire area is hermetically sealed normally, and only by starting the variable-frequency main fan 6 to operate normally can the production requirements be met;

[0049] Due to the large area of the fire area isolation zone and the fact that personnel do not have the conditions to enter the fire area for detailed inspection, in order to prevent the formation of poisonous smoke, poisonous dust, and high temperature in the newly fired area from endangering underground workers, SO2 online monitoring is used to detect the intake shaft 11 and the production shaft 4. By adjusting the variable-frequency main fan 6 and the forced ventilation fan 7, a cooperation with the natural wind pressure of the fire area is formed. Under the action of three factors, there is no wind pressure or weak wind pressure in the fire area, cutting off or reducing the ventilation and oxygen supply to the fire area, reducing the temperature of the fire area, and creating a favorable environment for underground production personnel to escape or for normal production;

[0050] In addition, the combustible ore rock undergoes an exothermic reaction, causing the temperature in the fire area isolation zone to rise, forming a negative pressure area of natural wind pressure, attracting the air in the working area to gather towards the fire area. The negative pressure of the variable-frequency main fan 6 is opposite to the direction of the natural wind pressure, and the difference between the two can be adjusted by the forced ventilation fan 7;

[0051] The above steps can enhance its own functionality.

[0052] In the description of the present utility model, it should also be noted that unless otherwise clearly specified and defined, the terms "set", "installed", "connected", and "coupled" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0053] Finally, it should be noted that the above are only the preferred embodiments of the present utility model and are not used to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A surface extraction fire prevention and extinguishing structure for a non-ferrous metal spontaneous combustion mine, characterized in that: include: A main body component, the main body component comprising a mine body (1); A fire prevention and extinguishing component, the fire prevention and extinguishing component comprising an air intake shaft (11), an underground fire zone (2), and a fire zone isolation zone fissure zone (3); The air inlet shaft (11) is fixed on one side of the opening of the mine body (1), the underground fire zone (2) is arranged inside the mine body (1), and the fire zone isolation zone fissure zone (3) is arranged inside the mine body (1) and is closely attached to one side of the underground fire zone (2); a production well (4) is arranged deep inside the mine body (1), and the production well (4) and the fire zone isolation zone fissure zone (3) are opposite to each other; SO2 online monitoring equipment (5) is fixed on the surface of the underground fire zone (2) and inside the middle production well (4), and a variable frequency main fan (6) is fixed on the other side of the opening of the mine body (1); forced-in fans (7) are arranged inside the production wells (4) on both sides in the middle, and a wind flow sealing wall (8) is arranged on one side of the surface wall of the production well (4).

2. The surface extraction type fire prevention and extinguishing structure for a non-ferrous metal spontaneous combustion mine according to claim 1 is characterized in that: The underground fire zone (2) is a closed isolation zone, the surface part is covered and filled with mud, and isolation walls are built in each middle section of the underground.

3. The surface extraction type fire prevention and extinguishing structure for a non-ferrous metal spontaneous combustion mine according to claim 1 is characterized in that: The fire zone isolation zone fissure zone (3) is the covering layer of the fire zone isolation zone, and isolation walls are built in each middle section of the well.

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